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We were only issuing one kernel warning when we couldn't resolve a path to an inode due to excessive retries. It was hard to capture and we only saw details from the first instance. This adds a counter for each time we see excessive retries and returns -ELOOP in that case. We also extend the link backref adding trace point to include the found entry, if any. Signed-off-by: Zach Brown <zab@versity.com>